ISIS call for Hijrah

In Dabiq Issue #1, the Islamic State called for hijrah, to the land of Islamic State, the Sunni areas of Iraq and Syria, that they have occupied.
Specifically, ISIS published:
“Therefore, rush O Muslims to your state.
Yes, it is your state. Rush, because Syria is not for the Syrians, and Iraq is not for the Iraqis.

The earth is Allah’s. {Indeed, the earth belongs to Allah. He causes to inherit it whom He wills of His servants.
And the [best] outcome is for the righteous}

The State is a state for all Muslims.
The land is for the Muslims, all the Muslims.
O Muslims everywhere, whoever is capable of performing hijrah (emigration) to the Islamic State, then let him do so, because hijrah to the land of Islam is obligatory.”

Many Muslims have answered this call, as if obligated to do so, and as this army organized, the mass killings of Shiites, Yazidis, Christians, and even other Sunnis, began, in a reign of terror.

By the time other countries intervened, not only had mass killings and conversions to Islam taken place, they also were publicized in propaganda. This allowed more recruiting of radical Islamic youth that were able to use all of the military hardware, stolen from the Iraq Shiite army, that was easily visible from the sky and not destroyed by Western forces.
Basically, young jihadists from all over the world, felt empowered to do hijrah, to ISIS.